Rectangular rapid flash beacon (RRFB)
Publisher: U.S. Dept. of Transportation, Federal Highway Administration
Published: 2009
Place of publication: Washington, D.C.]
Language: eng
Format: [electronic resource]
Subjects: Roads; Interchanges and intersections; Safety measures; Traffic signs and signals; Pedestrian crosswalks
Notes: Title from title screen (viewed on July 16, 2012).

"May 2009."

"FHWA-SA-09-009."

Includes bibliographical references.